KERI RUSSELL, 37

Going from curly to straight is the only noticeable difference in the former Felicity star, who in 1998 made waves as the show's titular curly-haired ingenue. When the series wrapped four seasons later, Russell appeared in movies such as 2007's Waitress, before making a return to TV in 2013, earning praise as a spy-next-door undercover KGB agent in The Americans. As for keeping her Felicity-era glow, the mom of two, seen at right at the August 2013 premiere of her filmAustenland, credits a nerdy workout video she does in her closet, plus a healthy attitude. "I'm not a complainer about age. I think my girlfriends all look so much better now than they did 15 years ago," she tells Women’s Health.